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Finding the Fourth Proportional to 485,205.80, 669,586.74 and 281,377.73

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Solution

The fourth proportional to 485,205.80, 669,586.74 and 281,377.73 is: 388,302.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,205.80 : 669,586.74 = 281,377.73 : x
  2. Step 2: Convert to fraction form
    485,205.80/669,586.74 = 281,377.73/x
  3. Step 3: Cross multiply
    485,205.80x = 669,586.74 × 281,377.73
  4. Step 4: Simplify right side
    485,205.80x = 188,406,797,558.10
  5. Step 5: Solve for x
    x = 188,406,797,558.10/485,205.80
  6. Step 6: Final answer
    x = 388,302.86

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.